Edwin l



(No Model.)

B. L. GRAY.

EXTENSION SCREEN.

No. 388,276. Patented Aug. 21, 1888 article and the obtaining EDWIN L.GRAY, OF BURLTNGTON, V

PATENT @FFTCE.

ERMONT, ASSIGNOR TO THE PORTER MANUFACTURING COMPANY, OF SAME PLACE.

EXTENSlON-SQREEN.

SPECIFICATION forming part of Letters Patent No. 388,276, dated August21, 1888.

Application filed January 29, 1887. Serial No. 225,881. (No model.)

To ctZZ whom it may concern.-

Be it known that I, EDWIN L. GRAY, of Burlington, in the State ofVermont, have invented a new and useful Improvement inExtension-Screens, of which the following is a specification.

This improvement relates to thatkind of extensionscreen described andshown in Letters Patent No. 355,605, dated January 4t, 1887 that is tosay, a screen in which the screenframe is combined with guide-railsprovided with guide-grooves on their interior opposite edges, slidingextension-strips overlapping the guide-rails externally and provided ontheir inner faces with tongues and grooves to engage those of theguide'rails, and stops to limit the movement of said strips. In the saidpatented device the tongues and grooves on the extension-strips areformed of the same material which constitutes the strips themselves, thetongues being in one with the strips. My improvement consists in formingsaid tongues of metal, said metal bounding also one side of the groovesand being applied and secured to theinner faces of the strips at or nearthe ends of thelatter. The advantages due to the improvement areincreased stability ofthe of tongues which slide truly and withoutdanger of cramping, liability to whichlatterexists with the woodentongues, owing to the warping of the material of which they are made.

To ascertain more definitely and particularly the nature ofmyimprovement,reference may behad to the accompanying drawings, in whichFigurel is a plan of the screen with parts of it broken away, thesliding extension-strips being represented by dotted lines in extendedposition. Fig. 2 is an end elevation of the screen. Fig. 3 is section online 3 3, Fig. 1. Fig. t is a perspective view of one of the extcnsionstrips, looking at its inner face.

A is the screen-frame. I5 is the wire gauze or netting secured upon oneface thereof. 0 represents the two parallel guide-rails secured toopposite bars of the frame and provided at their ends in their interioropposite edges next to the screen with gnide-recesses a, which formgrooves bounded on one side by the screenframeand on the other side bythe rails. The partsb adjoining the grooves form tongues to entergrooves in the sliding extension-strips. Driven through the screenframe, so as to extend crosswise of the groo ves,are stop pins or studsf.

Thus far the structure is substantially the same as that described andillustrated in Letters Patent No. 355,605, above referred to.

Between the guide-rails 0 and at opposite ends of the screcn-frainearemounted the sliding extensionstrips D. These strips (as in the aforesaidpatented device) equal in length the sides of the frame to which theyare ap plied and overlap the guide-rails. They also are tongued andgrooved at each end; but the tongues and grooves are formed not whollyin and of the wooden strips themselves, but by metal plates E. Eachstrip has in its inner face at each end a recess of a depth equal tothat required for the groove. A second recess, m, below the one firstabove mentioned is also provided of such dimensions as will permit themetal plate E when applied thereto to be about flush with theinner faceof the extension-strip. The metal plate is littcd to and secured in therecess by screws, as shown, or other suitable means, in such positionthat its upper edge will project faizenough above the bottom of theguide-recess in the extensionstrip to form a tongue, d, which convertsthe guide-rcccss into a guide-groove, c, the inner side of which isbounded by said tongue. In the metal plate is also formed a longitudinalslot, (2, through which the stop-pinfpasses. The length ofthe slotlimits the extent of sliding motion of the strip D.

I remark here that the lower portion, :0, of the plate between the endsof the slot can be cut away, if desired.

In order to provide means by which the proper position of the plate E inthe strip D can be readily ascertained and assured, 1 provide it on itsfront face with a shoulder or projecting pin, a, which projects at right111- 5 gles to the plate and stands in a line at right angles to theupper longitudinal edge of the tongue port-ion of the plate. \Vhen theplate is fitted to the strip, this shoulder or pin should rest againstthe inner longitudinal edge of the strip D,with its upper or outer endflush with the bottom of the guide-groove 0. When thus placed, the plateE is in the position which it should occupy on the strip.

Having described my improvement, What I claim, and desire to secure byLetters Patent, 1s

1. The combination, with the screen-frame and the guide-rails 0,provided with tongues and grooves on their interior opposite edges, asdescribed, of the sliding extensionstrips D, overlapping the guide-rails externally and formed on their inner faces with guide-rccesses,the slotted metal plates E, secured to the inner faces of said strips,so that their upper longitudinal edges shall project above the bottom ofsaid guide'recesses to form guidetongues which bound said recesses onone side, and the stop pins or studs secured to the screen-frame andextending crosswise through 20 'the slots in said plates, as and for thepurposes hereinbefore set forth.

2. The slotted metal guide-plates E, formed with shoulders n, incombination with the re cessed extension-strips D, the guide-rails O, 25the screenframe, and the stop pins, these parts being constructed andarranged for joint operation as hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 27th day ofJanuary, 1887.

EDWIN L. GRAY.

Witnesses:

WILLIAM H. H. CQNNER, THEODORE S. Peon.

